Synchronizing system



Nov. 10, 1931. A. F. CONNERY SYNCHRONIZING SYSTEM Filed March 6. 1930 In u IIR T l INVENTOR ALDER ECONNERY I BY ATTORN EY Patented Nov. 10,1931

UNITED STATES.

PATENT OFFICE ALDER. r. CONNERY, or BROOKLYN, NEW YORK, ASSIGNOR TO INTERNATIONAL com- MUNICATIONS LABORATORIES, INC., or NEW YORK, N. Y., A CORPORATION on EW YORK SYNCHRONIZING SYSTEM Application filed. March 8, 1930. Serial No. 483,620.

This invention relates to telegraph systems and more particularly to a type of corrector system for use with synchronous telegraphy using the three element code. Telei graph systems of this type usually comprise two or more commutators or distributors with means for maintaining said distributors in synchronism with each other. This system is well adapted for use with submarine cable signalling but is not limited to such a use.

It has heretofore been customary to employ rather complicated electrical correction circuits in connection with synchronizing devices, which are adapted to correct whenever the wires touch each other or a grounded object. If an abnormal number of correc tions occur when the signals are so distorted, it will result in the distributors being thrown out of synchronism with each other.

In some telegraph systems, synchronizing impulses are transmitted at definite periods and in this way the corrector mechanism at the correcting station is only operated when the brushes are in synchronizing position. The disadvantage of this system is that a certain part of the line or signalling time is given up to the transmission of synchronizing impulses which reduces the systems capacity for carrying message traflic.

provide some means for stepping the brushes back into phase at frequent intervals.

The object of this invention is to provide a simple mechanical correcting system which will function with the three unit code and which will step the brushes back a limited number of times during each revolution of the distributor.

A further object is to provide a device which will operate on signalling impulses, tt'jhereby eliminating the loss of transmission line.

A more clear conception of the operation, construction and further objects ofthe invention may be had from the following description taken in conjunction with the accompanying drawing which shows the circuit and mechanical details necessary for a successful operation of the invention.

The corrector rings of the distributor are shown at A in produced relation. These segments comprise an undivided ring 1 which is associated by a brush 4: with a broken ring made up of segments of various lengths, namely 2 and 3. Segments 3 are all grounded while segments 2 are connected to the locking relay R of the correction circuit by conductor 5. The ring 1 is connected through polarized relay P to the line relay L by conductor 6.- The line relay L is well 'known in the art as a three position relay, i. e. when no current is flowing in the winding the tongue 7 is held in a central position, by

springs, between the contacts 8 and 9. Contacts 8 and 9 are connected to positive and negative battery respectively. 'The tongue 7 is connected to ground through the winding of polarized relay P which has its tongue 10 connected to battery through condenser 11 and its spacing contact 12 connected to battery through a resistance 14. The marking contact 13 of relay P is connected to corrector ring 1 over conductor 6.-

A drive shaft 15 for the distributor driven by means not shown carries a fly wheel 16 and freely rotating brush carrier 17. The brush carrier has a gear wheel 18 formed integral therewith which meshes with a pinion 19 secured to a short shaft 20 whichv is journaled in a control disc 21 operatively secured to shaft 15 by any suitable means such as a pin 22. The other end of shaft 20 has a star wheel 23 secured thereto which is prevented from rotating by a spring actuated detent roller 28 carried by control disc 21. Secured to shaft 15 is a cam member 24 adapted to cooperate with a contact arm 25 thereby opening the operating circuit for the col-rector magnet M and the locking circuit for relay R once during each revolution of the brushes 4. The armature 26 of the magnet M is operatively connected to pin 27 which is adapted to be introduced into the path of the star wheel 23 thereby angularly displacing the brushes with respect to the distributor.

The above described circuit and apparatus functions in the following manner. Incoming signals operate the signal relay L in accordance with positive or negative battery pulses transmitted over the line. The three element code uses these pulses for signals, and spaces are designated by no current, at which time the tongue 7 remains in the central position. The positive pulses only, are used for correcting purposes. When a positive pulse is received contact 8 is closed, closing a circuit from the positive side of battery through the winding of the polarized relay P to ground. This relay is so biased that it will only operate on positive current. Upon the operation of relay P the tongue 10 moves to the marking contact 13. Prior to this time a circuit has been closed through the spacing'eont'act 12, thereby dischargingcondenser 11. Vhen the marking contact 13 is closed the condenser 11 is charged over a circuit from battery, condenser 11, conductor 6, ring 1, brush 4 through one of segments 3 to ground. Segments 3 are charging segments while segments 2 are correcting segments. Therefore, if the brushes 4 are correctly phased the brushes will be on the charging segments 3 and the condenser 11 will be charged as described above. If, however, the brushes are out of phase, they Wlll be ahead of their correct position and on segments 2. Therefore the condenser 11 will be charged over conductor 6. ring 1, brush 4:, segments 2, operating winding of relay R to ground, thereby producing a surge which will operate relay R. Although the contact arm 25 is shown in an open position, it normally is closed when correcting surges are received thereby closing an operating circuit for magnet M and a locking circuit for relay R from ground through the locking winding and make contact of relay R, winding of magnet M, contact arm 25 to battery. The operation of magnet M moves pin 27 into the path of the star wheel 23 through the agency of magnet armature 26. When the star wheel 23 comes into contact with pin 27. said wheel is rotated, in turn stepping back the brushes 4 through the medium of gears 19 and 18. Immediately following this operation the cam 24 momentarily opens the locking circuit of relay R, thereby causing the deenergization of magnet M and relay R and restoring the circuit for use in a further correcting operation.

It is apparent from the above description that this system of correction will easily correct any differences of phasing between two or more distributors with a minimum of loss of signalling time, and will also effect said correction at a fixed point in the cycle of the distributor.

What is claimed is:

1. A synchronizing system for telegraph apparatus comprising a signal receiving relay, a polarized relay connected thereto and operated thereby, a distributor comprising plain and segmented rings, alternate segments of which latter ring are grounded, a brush adapted to cooperate with said rings, means for rotating said brush, mechanical means adapted to adjust the angular position of said brush with respect to said distributor at a fixed point in its cycle. a circuit connecting said polarized relay and said mechanical means, a condenser in said circuit, the surge from which is permitted to operate said mechanical means when the brush is in contact with those segments of the segmented ring which are not grounded.

2. A synchronizing system for telegraph apparatus comprising a distributor, a brush cooperating therewith, means for rotating said brush, means for angularly displacing said brush with respect to said distributor at a fixed point in its cycle and a condenser device controlling the operation of said mechanical means.

3. A synchronizing system for telegraph apparatus comprising a distributor, a brush rotating with respect thereto, means for rotating said brush, mechanical means for changing the angular displacement of said brush with respect to said distributor at a fixed point in its cycle, a condenser, the surge of which controls the operation of said mechanical means and a relay having a locking circuit to insure said angular displacement.

4. A synchronizing system for telegraph apparatus comprising a three position signal receiving relay, an armature therefor, a circuit including said armature, a polarized relay in said circuit, an armature for said polarized relay, a second circuit including said last mentioned armature, a. condenser, a brush, a relay and an operating magnet in said second circuit, a. distributor with which said brush cooperates and mechanical means for angularly displacing said brush with respect to said distributor at a fixed point in its cycle when said brush is out of synchronism with received signals and said second circuit is completed by said'polarized relay.

5. A synchronizing system for telegraph apparatus comprising a distributor, a brush therefor, means for rotating said brush, mechanical means adapted to angularly displace said brush with respect to said distributor, a polarized relay, a condenser charged by the operation of said polarized relay on the re ceipt of signals of one polarity only, said condenser surge operating said mechanical means when said brushes are out of synchronism with said signals and at a fixed point in the cycle of said distributor.

6. A synchronizing system for telegraph apparatus comprising a signal receiving relay, a condenser controllable by said relay, a rotary member normally in phase with said signals, a corrector magnet operable under control of said condenser as the rotary member tends to move out of phase, mechanical means including said magnet for correcting the position of said rotary member at a fixed point in its cycle and a holding circuit for said corrector magnet.

7. A synchronizing system for telegraph apparatus comprising plain and segmented distributor rings, a brush adapted to cooperate therewith, a condenser adapted to charge and discharge through said rings, means for rotating said brush, mechanical means adapted to angularly displace said' brush at a fixed point in its cycle to keep it in phase with received signals, and a locking relay and operating magnet controlling said mechanical means.

8. In a synchronizing system for telegraph apparatus, a distributor, a brush moving thereover, a three position signal receiving relay, a polarized relay having a plurality of contacts, a condenser, said condenser being charged through one of said contacts and discharged through another of said contacts, and means operable by said condenser surge when said brushes move out of synchronism to cause angular displacemnt ofsaid brush at a fixed point in its cycle to move it into synchronism.

9. In a synchronizing system for telegraph apparatus, a distributor, a brush moving thereover, means for rotating said brush, a condenser, a relay, said condenser being charged and discharged by said relay in accordance with received signals, a locking relay operable by said condenser surge and means under the control of said locking relay when said brushes move out of synchronism with said signals to cause angular displacement of said brush at a fixed point in its cycle to move it into synchronism;

In witness whereof, I hereunto subscribe my name this 1st day of March, 1930.

ALDER F. CONNERY. 

